Stylize teckids event

Stylizes the teckids_event-shortcode.

Adds possiblity for shortcode bodies.

sass/_utils.scss

@@ -13,3 +13,7 @@ figure.image > figcaption {
 .content .gallery figure {
   margin: 0;
 }
+
+.is-fullheight {
+  height: 100%
+}